[Form] Fix phpdoc on FormBuilderInterface

Author: nicolas-grekas

FormBuilderInterface.php

@@ -28,7 +28,7 @@ interface FormBuilderInterface extends \Traversable, \Countable, FormConfigBuild
      * @param string|FormBuilderInterface $child
      * @param array<string, mixed>        $options
      *
-     * @return self
+     * @return static
      */
     public function add($child, string $type = null, array $options = []);
 
@@ -55,7 +55,7 @@ public function get(string $name);
     /**
      * Removes the field with the given name.
      *
-     * @return self
+     * @return static
      */
     public function remove(string $name);
 

Util/ServerParams.php

@@ -41,7 +41,7 @@ public function hasPostMaxSizeBeenExceeded()
     /**
      * Returns maximum post size in bytes.
      *
-     * @return int|null The maximum post size in bytes
+     * @return int|float|null The maximum post size in bytes
      */
     public function getPostMaxSize()
     {